How Can I Convert PST Files to MBOX Without Losing Data?

I have some old Outlook PST files containing important emails, and I need to move them to Thunderbird, which uses MBOX format. I am looking for a safe and reliable way to convert these PST files to MBOX without losing any emails, attachments, or folder structure. Could anyone guide me on the process or recommend tools that can help with this conversion? I want to make sure the migration is smooth and that no data is corrupted during the process.
 
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